Complete the following sentences choosing the correct word or words from those given in brackets at the end of each sentence:

(i) The properties of the elements are a periodic function of their …………… (atomic number, mass number, relative atomic mass).

(ii) Moving across a …………… of the Periodic Table the elements show increasing …………… character (group, period, metallic, non-metallic).

(iii) The elements at the bottom of a group would be expected to show …………… metallic character than the element at the top (less, more).

(iv) The similarities in the properties of a group of elements are because they have the same …………… (electronic configuration, number of outer electrons, atomic numbers)

(i) Atomic Number.

(ii) Period, Non-metallic.

(iii) More.

(iv) Number of outer electrons.